/Engine/Source/Runtime/Slate/Public/Widgets/Layout/SWindowTitleBarArea.h
static void SetCustomStyleForWindowButtons ( const [FButtonStyle](API\Runtime\SlateCore\Styling\FButtonStyle) & InMinimizeButtonStyle, const [FButtonStyle](API\Runtime\SlateCore\Styling\FButtonStyle) & InMaximizeButtonStyle, const [FButtonStyle](API\Runtime\SlateCore\Styling\FButtonStyle) & InRestoreButtonStyle, const [FButtonStyle](API\Runtime\SlateCore\Styling\FButtonStyle) & InCloseButtonStyle )